Ruler-within pen



FIG. 1 is a perspective view of ruler-within pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof.

FIG. 8 is a perspective view, shown with the cap removed; and,

FIG. 9 is another perspective view, shown with the ruler extended. 

The ornamental design for ruler-within pen, as shown and described. 